位移时空综合分析法及其在深基坑中的应用   总被引：2，自引：4，他引：2  

杨志法  张红梅 《工程地质学报》1995,3(4):32-38

对于岩土工程设计和施工来说,如何对监测所获的位移信息进行分析十分重要。以往主要采用位移-时间的分析方法。但为了使信息在修改设计和指导施工方面起更大作用,本文提出位移空间比较分析法,并主张与常用的位移-时间分析方法结合使用,以形成所谓位移时空综合分析法。在济南彩云大厦深基坑等的成功应用,表明该法是可行的。  相似文献   

Discriminating treed and non-treed wetlands in boreal ecosystems using time series Sentinel-1 data     

《International Journal of Applied Earth Observation and Geoinformation》2020

  相似文献   

Groundwater quality monitoring system in zones of infrastructure facilities     

G. Rasula  M. Rasula   《Engineering Geology》2001,60(1-4):351-360

Protection of groundwater already is and will also be in the future, a particularly important environmental, socio-economic, social welfare and political task. The fact that the costs of preventive measures are 10–20 times lower than the funds needed to clean up and revitalize polluted aquifers, as well as the fact that the area to be occupied with transport communications and other infrastructure facilities will aggravate protection, both call for an urgent introduction of modern methods of monitoring and preserving all the existing and potential groundwater resources. The basic principle of groundwater protection against pollution means constant control and preventive measures of protection, namely prevention of incidental and other kinds of pollution. The very construction of communications and all accompanying facilities changes and degrades the existent natural geological environment, and when in use they may become structures in whose immediate surrounds surface and ground waters may be polluted by the toxic and waste substances transported. The experience gained through the following activities: the ‘pilot model’ for groundwater monitoring in the zone of Makis, the investigations and monitoring of critical sites polluted with xylene (CIP, Belgrade, 1994/95), and information on the latest achievements in this field in the world (obtained while working on the study of methodology of hydrogeological investigations needed for groundwater quality monitoring system — Jaroslav Cerni Institute for the Development of Water Resources, Belgrade, 1998), stresses a necessity to obligatory design and construct operational systems for groundwater quality monitoring, particularly in the zones of infrastructure facilities (roads, railway, gas pipelines, oil pipelines), which can be considered as potential linear polluters. In that light, this paper is a contribution to developing hydrogeological investigation methodology for designing and operating a monitoring system in the zones of roads, and its legal and practical incorporation in the technical documents of each project. Besides, an emphasis is put on multidisciplinary approach to system implementation, its full automation, rational management, and effective and optimal measures for groundwater protection.  相似文献   

山东数字遥测地震台网地震监测能力评估   总被引：3，自引：0，他引：3  

季爱东  石玉燕 《高原地震》2001,13(2):47-52

根据地震仪器的性能对山东数字遥测地震台网的监测能力进行评估，并利用2000年3－10月地震资料进行了检验。其结果为：山东地区12％的面积监测能力为ML≥2.0级，山东中部及渤海、黄河沿海地区监测能力为ML≥2.5级，渤海、黄海近海地区的监测能力为ML≥3.0级。最后指出台网布局的疏密程度、观测条件及台基条件的优劣等是影响台网监控能力的重要因素。  相似文献   

福州市温泉区地面沉降监测与沉降规律分析     

黄国烟 《测绘工程》1996,5(3):59-63

应用精密水准测量方法，于１９９３年在温泉区取得三个周期的观测成果，结合以往资料进行综合分析，得出初步结论。并为福州市地下热水开采的控制、预防及减轻因沉降产生的地灾害方面提出有益的建议。  相似文献   

地震断层气监测的现状与展望   总被引：1，自引：0，他引：1  

陈万春 《四川地震》1996,(2):56-61

断层气测量是地震科学研究的重要方法之一，断层气测量具有实用、轻便、快便、价廉等优点，在地震监测预报和减灾活动中具有广阔的应用前景和巨大的潜力。本文对断层气测量在地震科学中的应用和现状作了简要的介绍，同时探讨了我国地震断层气监测系统中存在的一些主要问题，对今后的发展进行了展望。最后简单介绍了几种断层气监测新技术及新型气敏传感器。  相似文献   

基坑支护组合钢支撑设计与施工技术     

张建  尹桂明 《江苏地质》2001,25(3):161-165

通过镇江市邮电通信指挥中心大楼深基坑工程的设计与施工,全面介绍了组合钢支撑在深基坑支护工程应用中的设计、施工方法及支撑效果.实践证明,组合钢支撑是一种施工方法简单、施工速度快、对周边环境影响小、安全可靠的支撑形式,具有较强的市场竞争能力及良好的推广应用前景.  相似文献   

How to obtain alert velocity thresholds for large rockslides   总被引：1，自引：0，他引：1  

G.B Crosta  F Agliardi 《Physics and Chemistry of the Earth》2002,27(36):1557-1565

A reliable forecast of the failure stage of large rockslides is difficult, because of non-linear time dependency of displacements and seasonal effects. Aim of this paper is to suggest a practical method to prepare alert thresholds for large rockslides, assessing critical values of velocity for carrying out civil protection actions using monitoring data. Adopted data concern the 20 Mm³ Ruinon rockslide (Valfurva, Central Alps, Italy), still evolving and suitable to originate a fast moving rock avalanche. Multitemporal analysis of aerial photos, LIDAR-ALTM laser topography, field survey and geomechanical analyses allowed to infer the rockslide kinematics and better understand data provided by a monitoring network including distometers, extensometers, GPS benchmarks and inclinometers. The analysis of displacement and rainfall data over five years (1997–2001) allowed to recognise three different evolutionary patterns of displacements, showing a continuously increasing rate since 1997. Data representing large-scale behaviour of the rock mass were fitted by power-law curves, according to the “accelerating creep” model by Voight, in order to evaluate a suitable failure time. This was hampered by the large seasonal deviations, which can significantly delay the occurrence of failure. Data were fitted using the Voight’s equation, expressed in terms of displacement, through non-linear estimation techniques, in order to find values of the controlling parameters (A, α and t_f) suitable to represent the mechanical behaviour of the rock mass approaching the failure. This allowed to compute velocity–time theoretical curves and to define different velocity threshold values (pre-alert, alert and emergency) to be used for emergency management.  相似文献   

基于GPS技术的大型结构建筑物动态监测   总被引：7，自引：4，他引：7  

程朋根  熊助国  韩丽华  徐云和 《华东地质学院学报》2002,25(4):324-328,332

在回顾传统的结构物震动和位移测量方法的基础上，详细阐述了采用GPS进行大型建筑物动态监测的原理、方法。介绍国内外典型的动态监测实例，提出了监测数据的管理与可视化方案，对未来大型结构建筑物动态监测的技术进行了展望。  相似文献   

Observations of particle movement in a monitoring well using the colloidal borescope     

Peter M. Kearl 《Journal of Hydrology》1997,200(1-4):323-344

The colloidal borescope consists of a set of lenses and miniature video cameras capable of observing natural particles in monitoring wells. Based on field observations of these particles, it appears possible to measure in situ groundwater velocity in a well bore. Field observations have shown that directional measurements using the colloidal borescope are generally in good agreement with expected flow directions. However, the magnitude of flow velocity is higher compared with values based on conventional test methods. High relative flow velocities, even after correction factors have been applied to compensate for well bore effects, are believed to be due to preferential flow zones in the surrounding aquifer. Low flow zones exhibit swirling multidirectional flow that does not allow for a linear velocity measurement. Consequently, groundwater flow velocities measured by the colloidal borescope in heterogeneous aquifers will be biased toward the maximum velocity values present in the aquifer. A series of laboratory experiments was conducted to assess the reliability of the instrument. Based on this work, a seepage velocity correction factor ( ) of 1–4 was found for quantifying groundwater seepage velocity in the adjacent aquifer from observations in a well bore. Laboratory measurements also indicate that preferential flow in the surrounding aquifer dominates flow in the well. Results of this work suggest the possibility of quantifying higher-flow velocities associated with preferential flow zones in the subsurface.  相似文献